Threshing-machine



D.- STAFFORD.

Thrashing Machine.

No. 1,613. Patented May 19, 1840'.

9511315, Phoho-Ulboxnpher, Wahingmn. nc.

DAVID STAFFORD, JR, OF SYRACUSE, NENV YORK.

THREsHING-MACHINE.

Specification of Letters Patent No. 1,613, dated May 19, 1840.

To all whomit may concern Be it known that 1, DAVID Srnrronn, Jr., of the village of Syracuse, county of Onondaga, State of New York, have invented a new and useful Improvement upon Threshing-Machines for the Threshing of All Kinds of Grain; and I do hereby declare that the following is a full and exact description of the same.

The nature and object of my invention consists in constructing the apron of the machine or the platform on which the grain is placed for feeding the machine with two sections, the one of which next to the cylinder of the machineis hung with hinges or pivots and supported with a springor otherwise, so as to drop or fall whenever any stone, stick or other l hard substance may pass into the machine with the straw or otherwise letting the substance fall to the ground, and thus preventing fractures and injuries to the machine; and in giving a full and clear description of the construction and operation of the said machine and the improvement thereupon I refer to the annexed drawings, making a part ofthis specification, in which Figure 1 is a perspective view of the ma-. chine with the cylinder removed therefrom, so as to exhibit the concave bed of the. machine, in which the teeth are embedded, and over which the cylinder, also constructed with teeth, revolves, and also the two sections of the apron or platform above re-.

ferred to. Fig. 2 represents the section of the apron which drops with the springs for supporting the same, being an inverted view of the same. No. 3 represents the machine as viewed from beneath. I

Letters A on the Figure No. 1 represent the forward parts of the frame of the machine, the whole frame consisting of four parts, two girts two side plank and one dust board, the said forward parts being four feet in length and inclining back toward the apron a from the cylinder 19 inches at the top. Letters B, represent the side plank into which the forward parts are framed or locked four feet in length and fifteen inches inside, and also framed into the back parts marked (Z. The back parts marked at are two feet five inches high, with a cross girt ten inches from the bottom framed into them to strengthen them. C represents a girt framed into the forward parts at the bottom. D represents a girt framed into the cave f is removed. Said drop apron being hung by pivots or tenons in the side plank or by hinges to other parts of the machine, so that any hard substance dangerous to the machine in passing down the same toward the curved section G forces down the springs or other means by which the drop apron is supported from beneath and lets the substance'fall to the ground. The drop apron is about one foot in width and 'extendsjthe whole I distance between the side plank. Letter G represents a curved section of the drop apron about an inch and a quarter in width designed to bring any obstacle in contact with the teeth of the cylinder before the obstacle comes in contact with the conand is built with a curve concentric with 9 the circle described by the points of the teeth of the cylinder revolving above it. Letters 1) represent the boxes on which the arbors of the cylinder rest and are made by cutting a semicylindricalsection from the top of the side plank suitable to the dimensions of the arbors of the cylinder. Letter 0 represents a cap upon the tops of the forward parts about five inches in width. Fig. No. 2 represents the drop apron inverted for the purpose of exhibiting the springs by which the same is supported. The drop apron consists of a plank about two inches thick and one foot in width and is located in the machine as specified in the description of Fig. No. 1. Letters A rep- .resent a steel spring with a cast iron cap the concave at the points marked 6. The

spring is about one quarter of an inch by half an inch in the cap or center, and about a sixteenth of an inch in thickness at the point equidistant between the center of the spring is flattened out at the points A, so as i to make the elastic points'of the spring at the spots designated by those letters. .The'

7 Fig. No. 3 presents cap a has a chamber running longitudinally through it of such dimensions as to receive the spring passing to the same and is fastened to the lowerrside of the apron by screws, as represented in the figure. The extreme end of the spring marked Z2 when the drop apron is "properly located in the machine, passes into the concave about three quarters of an inch, and rests upon iron bearings. described in Fig. No. 3 attached to the lower side of the-bed of the concave. Letters 0 represent the tenons on the side of the drop apron farthest removed from the spring. Said tenons are aninch and a quarter in length and passinto-holes cut with an auger or. otherjinstrument in the side plank of the machine. The tenons are. made round, being about an inch and a quarter in diameter, so that the apron when dropping, is supported at the point c'by the tenons. Letter D represents the edge of the curved section of the drop apron described in Fig. No. 1,-by letter G. 1 1

i an inverted view. of the whole machine. Letter A representsthe bed of the concave. Letter B represents the iron hearings or straps about janiinoh in width anditwo inches-long screwed'upon the lower side of the concave and turning under the edge of the bed of the concave and ter minatingin a grooveor indentation in the bed, thus forming a support for the extreme end of the spring, as, represented in the figure, and by. means of whichthe drop apron is secured in itsposition until the pressure of some hardsubstance forces back the spring from the bearing or' support and lets it fall into a vertioal'positionfsupported by the tenons'. 0 represents the pul ley of the cylinder, to which the power is applied by means of a strap or gearing.

And I refer also to Fig. No. 4 on the annexed drawing-as a part, of this my specification. Letter A represents thecylinder with the teeth inserted in it. *The cylinderis de signed to be abouta foot and a half in diameter and revolves over the bed'ofthe concave, as represented by f in Fig. No. 1, and is of such length as nearly to fill the space between the side planks B, asrepresented in Fig. No. 1. Letters B represent iron bands running about the ends of the cylinder to give it firmness and strength. G represents theth'rum around which the strap by means of which the power is applied to the machine "runs.

D represents a shaft running through the cylinder or fastened into the ends of the same, with suflicient projection at the one end to support thecylinderby resting in the socket b, as represented in Fig. No. l, and projecting from the other end of the cylinder far enough to pass through the 'thrum on the exterior of the side plank, leaving the part of-the shaft between the thrumY andw the end of the cylinder resting on the socket of. the side plank f in Fig. land revolving in it.

What I claim as j ny invention and improvement and desire to secure by Letters Patent, is-.'

,H-The mannerof constructing the feeding table or-jdrop apron, with one section to'drop with the hinge orpivot, and withthe springs 01 other meansunderneath tosustain the same as above describedfland the object of whichis toprevent injuryland fracture to the machine in the mannerbefore described.

.Thesameprincipleis applicable to all other machines for a? like or similar purpose, and my claim is not confined; to. machines of the peculiar constructi of that above described and specified:

. DAVID STAFFORD, JR.

I :Wit'nessesxf V ii HENRY DAVIS, J12,

DAVID, G. STAFFORD, 

